Synthetic optical holography for rapid nanoimaging
CIC nanoGUNE Seminars
- Speaker
-
Martin Schnell, nanoGUNE
- When
-
2014/05/05
13:00 - Place
- nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian
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- iCal
Holography has paved the way for phase imaging in a variety of wide-field
techniques, including electron, X-ray and optical microscopy. In scanning
optical microscopy, however, the serial fashion of image acquisition seems to
challenge a direct implementation of traditional holography. Here we introduce
synthetic optical holography (SOH) for quantitative phase-resolved imaging in
scanning optical microscopy. It uniquely combines fast phase imaging,
technical simplicity and simultaneous operation at visible and infrared
frequencies with a single reference arm. We demonstrate SOH with a scattering-
type scanning near-field optical microscope (s-SNOM) where it enables reliable
quantitative phase-resolved near-field imaging with unprecedented speed. We
apply these capabilities to nanoscale, non-invasive and rapid screening of
grain boundaries in CVD-grown graphene, by recording 65 kilopixel near-field
images in 26 s and 2.3 megapixel images in 13 min. Beyond s-SNOM, the SOH
concept could boost the implementation of holography in other scanning imaging
applications such as confocal microscopy.